草津白根火山周辺における酸性泉の化学成分と同位体組成

概要

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D/H, ^<18>O/^<16>O and ^<34>S/^<32>S ratios of acid hot spring waters and fumarolic gases around Kusatsu-shirane volcano were determined together with chemical components. From the chemical compositions acid hot spring waters were classified into acid chloride-sulfate type at Kusatsu and Manza, and acid sulfate type at Shirane kitagawa. The δ^<34>S value of sulfate in acid chloride-sulfate type waters is much heavier than in acid sulfate type. The thermal water at Kusatsu is considered to be mixtures of isotopically heavy and light sulfate. Although the two types of acid hot water are slightly enriched in D and ^<18>O compared to the respective local meteoric water, the thermal waters are essentially meteoric in origin. The stable isotopic evidences of acid hot springs and fumaroles suggest that the net-sulfur in acid chloride-sulfate type has δ^<34>S value around 0‰.
日本地球化学会の論文
1982-11-30